Jeep 1996 Grand Cherokee Service Manual page 974

ZJ
REMOVAL AND INSTALLATION (Continued)
(11) Remove the hydraulic valve tappets from the
engine cylinder head.
(12) Remove the vibration damper.
(13) Remove the timing case cover.
(14) Remove the timing chain and sprockets.
(15) Remove the front bumper and/or grille, as
required.
(16) Remove the camshaft (Fig. 41).
Fig. 41 Camshaft
INSTALLATION
(1) Inspect the cam lobes for wear.
(2) Inspect the bearing journals for uneven wear
pattern or finish.
(3) Inspect the bearings for wear.
(4) Inspect the distributor drive gear for wear.
(5) If the camshaft appears to have been rubbing
against the timing case cover, examine the oil pres-
sure relief holes in the rear cam journal. The oil
pressure relief holes must be free of debris.
(6) Lubricate the camshaft with Mopar Engine Oil
Supplement, or equivalent.
(7) Carefully install the camshaft to prevent dam-
age to the camshaft bearings (Fig. 41).
(8) Install the timing chain, crankshaft sprocket
and camshaft sprocket with the timing marks
aligned.
(9) Install the camshaft sprocket retaining preload
bolt. Tighten the bolt to 108 N·m (80 ft. lbs.) torque.
(10) Lubricate the tension spring, the thrust pin
and the pin bore in the preload bolt with Mopar
Engine Oil Supplement, or equivalent. Install the
spring and thrust pin in the preload bolt head.
(11) Install the timing case cover with a replace-
ment oil seal (Fig. 42). Refer to Timing Case Cover
Installation.
(12) Install the vibration damper (Fig. 42).
(13) Install the hydraulic valve tappets.
(14) Install the engine cylinder head.
(15) Install the push rods.
Fig. 42 Timing Case Cover Components
(16) Install the rocker arms and pivot and bridge
assemblies. Tighten each of the capscrews for each
bridge alternately, one turn at a time, to avoid dam-
aging the bridge.
(17) Install the engine cylinder head cover.
(18) Position the oil pump gear. Refer to Distribu-
tor in the Component Removal/Installation section of
Group 8D, Ignition Systems.
(19) Install the distributor and ignition wires.
Refer to Distributor in the Component Removal/In-
stallation section of Group 8D, Ignition Systems.
(20) Install the serpentine drive belt and tighten
to the specified tension (refer to Group 7, Cooling
System for the proper procedure).
NOTE: During installation, lubricate the hydraulic
valve tappets and all valve components with Mopar
Engine Oil Supplement, or equivalent. The Mopar
Engine Oil Supplement, or equivalent must remain
with the engine oil for at least 1 609 km (1,000
miles). The oil supplement need not be drained until
the next scheduled oil change.
(21) Install the A/C condenser and receiver/drier
assembly, if equipped (refer to Group 24, Heating and
Air Conditioning).
CAUTION: Both service valves must be opened
before the air conditioning system is operated.
(22) Install the radiator, connect the hoses and fill
the cooling system to the specified level (refer to
Group 7, Cooling System for the proper procedure).
(23) Check the ignition timing and adjust as nec-
essary.
(24) Install the grille and bumper, if removed.
(25) Connect negative cable to battery.
4.0L ENGINE 9 - 37